The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b4ab2c32985eb0b6af0556c2376a8598e2b0c134

commit b4ab2c32985eb0b6af0556c2376a8598e2b0c134
Author: michaeldo <michaeldo@chromium.org>
Date: Mon Feb 27 23:26:55 2017

Add CWVUIDelegate with method to customize context menu.

BUG= 696581 

Review-Url: https://codereview.chromium.org/2723433004
Cr-Commit-Position: refs/heads/master@{#453387}

[modify] https://crrev.com/b4ab2c32985eb0b6af0556c2376a8598e2b0c134/ios/web_view/internal/BUILD.gn
[add] https://crrev.com/b4ab2c32985eb0b6af0556c2376a8598e2b0c134/ios/web_view/internal/cwv_html_element.mm
[add] https://crrev.com/b4ab2c32985eb0b6af0556c2376a8598e2b0c134/ios/web_view/internal/cwv_html_element_internal.h
[modify] https://crrev.com/b4ab2c32985eb0b6af0556c2376a8598e2b0c134/ios/web_view/internal/cwv_web_view.mm
[modify] https://crrev.com/b4ab2c32985eb0b6af0556c2376a8598e2b0c134/ios/web_view/public/BUILD.gn
[add] https://crrev.com/b4ab2c32985eb0b6af0556c2376a8598e2b0c134/ios/web_view/public/cwv_html_element.h
[add] https://crrev.com/b4ab2c32985eb0b6af0556c2376a8598e2b0c134/ios/web_view/public/cwv_ui_delegate.h
[modify] https://crrev.com/b4ab2c32985eb0b6af0556c2376a8598e2b0c134/ios/web_view/public/cwv_web_view.h
[modify] https://crrev.com/b4ab2c32985eb0b6af0556c2376a8598e2b0c134/ios/web_view/shell/shell_view_controller.h
[modify] https://crrev.com/b4ab2c32985eb0b6af0556c2376a8598e2b0c134/ios/web_view/shell/shell_view_controller.m